hod g kins



C. H'ODGKINS.

Sewing Machine.

No. 69,666; I Patented Oct. 8, 1867.

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Letters Patent No. 69,666, dated October 8, 1367.

IMPROVEMENT IN SEWING MACHINES.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, O. HODGKINS, of Marlboro, in the county of Cheshire, and State of New Hampshire,

have invented a newand improved Sewing Machine; and I do hereby declare that the followingis a full, clear,"

and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates tocertain new and useful improvements in single-thread sewing machines, and it consists in an improved means for giving a proper degree of tension to the thread, as hereinafter fully shown and described, whereby an improved sewing machine of the class specified is obtained. In the accompanying" sheet of drawings- Figure 1 is aside view of my invention, partly in section, as indicated by the lines 2: rr, fig. 2. Figure 2, a vertical section of a portion of the same, taken in the line y y, fig. 1. Figure 3, a vertical section of a portion ofthe same, taken in the line 2 z, fig. 2. Similar letters of reference indicate like parts.

A represents the base of the machine; 13, the arm attached to the base, and of curved form, as shown clearly in fig. 1. O is the driving-shaft, having its hearings in the arm 13, and a wheel or circular plate, D, on its outer end, to which a pin or wrist, a, is attached, at a suitable distance from its centre, said pin or wrist working in a horizontal groove, 6, in a cross-bar, 0, attached to the needle-arbor E, the hearings or guides of which are at the outer end of. the arm B. The pin or wrist a of the wheel D, working in the groove 6 of bar 0, communicates an up-and-down movement to the needle-arbor E. The shaft C is drivenbygearing (I from a crank'wheel, F, and a horizontal feed-wheel. shaft, G, underneath or within the base A, is driven by gearing c from the same crank-wheel F. H is a feed-wheel, which is placed loosely on a small shaft, I, fitted in a suitable.

bearing, J, underneath or within thebase A. i The feedwhccl H has a toothed 01' serrated edge or periphery, and it projects through a slot, f, in a needle-plate, K, and base A, as shown in figs. 1 and 2. The shaft I is stationary, and a smaller shaft, 1*, passes longitudinally through it, and is 'allowed to turn freely, said shaft I* having a hook,'L, on its outer end of the usual form. On the inner end of the shaft I there is attached a plate, M, provided with a curved slot, g, in which is a crank, It, on the outer end of the shaft G, (see figs. 1 and 2.) The wheel H at its inner side is provided with an annular concentric flange, i, and within the circular rcccss formed by said flange there is a hub, N, which is fitted loosely on the shaft I, and has an arm or projection, j, a portion of which extends over the flange 2', and has a screw, 0, passing through it, as shown clearly iii fig. 2, the other portion of said projection being at the inner side of the flange 2', and nearly in contact with it. The hub N also has a projection, is, extending from it nearly opposite to j. P Q represent two dogs, connected together by a pivot, Z. One dog, P, is a portion of a ring, and is fitted around the hub N, not in contactthere with, but in' contact with the inner surface of the flange 2', the free or disengaged end of P being in contact with the portion of the projection j of the hub which is at the inner side of the flange 2'. (See fig. 2.) Thb inner side of the dog Q is provided with a shoulder, against which the end of the projection is is in contact, alnd the end of the crank it on the shaft G extends between the inner end of the screw 0 and the outer part of the dog Q. By this arrangement a vibrating movement is given the hook L by the working of the crank 71. in the slot 9 of the plate M, and thefeed-wheel H is moved by the action of the end of the crank it against the dog (1,.

friction of the dogs against the inner side of the flange 2' being suificient to produce that result. The return movement of the feed-wheel is caused by the end of the crank it coming in contact with the inncrend of screw 0, and. the length of feed may he graduated as desired by adjusting this screw. A nut, R, is fitted on theshaft I, and has a screw, m, passing into it, said screw passing through the arm of the bearing J. By this means the shaft I is prevented from turning. The needle-plate K has a hole, m punched throughit, from its outer or upper side downward, in such a manner as to leave a bur-1,12, to serve as a guide to the thread or loop, and pre= vents it from slipping away from the looper or hook. (Sec fig. 1.) In the upper part of the needle-arbor B;

there is fitted transversely and horizontally a small cylindrical rod, S, which is retained in the arbor'by means of a pin, 0, within the latter, fitting in a groove, p, made circumferentially in S, at about its centre, the pin 0 being pressed into the groove by a spring, q, as shown clearly in fig. 3. The rod has a hole, 7*, drilled obliquely 'into it at each end, for the thread s to pass through.

names 2 By this arrangement it will be seen that the thread is drawn straight each time the needle-arbor rises, and does not admit of the threari bowing out so much at the side of the needle opposite to that where the loop is taken, and the thread is kept ZliE-ZL more uniform stzt'ceef tensien, & variation in the thickness of the cloth not affecting it as much as hitherto. By turning the rod S the thread a may be tightened its desired.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent The rod S,.fitted transversely and llOIlZOl'ltQll; in the upper part of the needle-arbor E, secured tliereinby the pressnrepin 0, and provided with holes 1' for the thread 3 to pass through, substantially as and for the purpose specified.

O. HODGKINS. Witnesses:

WM. M. TEXNEY,

CHARLES SMITH. 

